Phosphate coating process and composition

Details Phosphate coating process and composition Phosphate coating process and composition

1980-12-08

1982-05-18

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

C23F 710

Patent

active

043303455

ABSTRACT:
This invention relates to a method of coating a metal surface with zinc and iron phosphate crystals for the purpose of improving corrosion resistance by means of a buffered zinc phosphate solution containing zinc dihydrogen phosphate and a monovalent, alkali metal salt of phosphate in proportions such that a fine, horizontal crystal structure consisting of tertiary zinc phosphate, zinc ferrous phosphate and other crystals of zinc ferrous phosphate is formed on the metal surface. The invention also relates to this composition.

REFERENCES:
patent: 1610362 (1926-12-01), Coslett
patent: 1911726 (1933-05-01), Tanner
patent: 2121574 (1938-06-01), Romig
patent: 2132000 (1938-10-01), Curtin
patent: 2132383 (1938-10-01), Romig
patent: 2310239 (1943-02-01), Jernstedt
patent: 2314887 (1943-03-01), Lodeesen
patent: 2375468 (1945-05-01), Clifford et al.
patent: 2487137 (1949-11-01), Hoover
patent: 3333988 (1967-08-01), Douty
patent: 3346426 (1967-10-01), Schlossberg
patent: 3619300 (1971-11-01), Heller
patent: 4089710 (1978-05-01), Cooke

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